The invention discloses a pinch device. The device comprises a first rotary component, a fixed pin rod, and a clamping mechanism, wherein the fixed pin rod is fixed on the first rotary component so as to rotate along with the first rotary component; the clamping mechanism comprises an upper clamping plate, a lower clamping plate and a power component, the upper clamping plate and the lower clamping plate are fixed on the fixed pin rod; the power component is connected with the upper clamping plate and/or the lower clamping plate so as to control the upper clamping plate and the lower clamping pate to clamp or loosen the object when the upper clamping plate and the lower clamping plate rotate along with the fixed pin rod. The device provided by the invention is used for solving the technical problems that the failure rate of the battery is high caused by the fact that by use of a pole piece transmission device, the back face of a pole piece is easily contaminated by the electrolyte and a polymer is easily extruded out in the prior art. The invention provides a pole piece pinch device capable of improving the reliability of the produced battery.